[rpc] disable trace api in rpc

[JackyWYX]

Issue

Trace APIs are heavy RPCs. Currently, the backend nodes are receiving a large amount of these RPC method calls, causing bad RPC service performance.

We will disable the Trace methods for now, meanwhile it will effect the explorer contract code verification. We will enable the methods in private methods later.

Test

Tested locally.

curl --location --request POST 'localhost:9500' \
--header 'Content-Type: application/json' \
--data-raw '{
    "jsonrpc": "2.0",
    "id": 1,
    "method": "hmyv2_traceTransaction",
    "params": []
}'
{"jsonrpc":"2.0","id":1,"error":{"code":-32601,"message":"the method hmyv2_traceTransaction does not exist/is not available"}}

@LeoHChen Please verify the result before deployment. Thanks.